Method and apparatus for harq operation-supporting uplink data transmission in a special subframe in a wireless communication system

ABSTRACT

Provided is a method of transmitting a Physical Uplink Shared Channel (PUSCH) in a special subframe by a User Equipment (UE). The method includes receiving an Uplink (UL) grant from a base station, the UL grant being included in a downlink time period of Time Division Duplex (TDD) cell, wherein the TDD cell having TDD UL/DL configuration 1, 2 or 6; determining a resource in an Uplink Pilot Time Slot (UpPTS) of a special subframe of the TDD cell to transmit a PUSCH associated with the received UL grant, wherein the special subframe, having subframe number 1 or 6, consists of a Downlink Pilot Time Slot (DwPTS), a guard period (GP), and the UpPTS; transmitting, from the UE, the PUSCH mapped to the resource in the UpPTS; and receiving a Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) responsive to the PUSCH.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.17/528,894, filed on Nov. 17, 2021, which is a continuation of U.S.patent application Ser. No. 16/535,395, filed on Aug. 8, 2019, nowissued as U.S. Pat. No. 11,212,041 on Dec. 28, 2021, which is acontinuation of U.S. patent application Ser. No. 15/474,373, filed onMar. 30, 2017, now issued as U.S. Pat. No. 10,454,624 on Oct. 22, 2019,which claims priority from and the benefit of Korean Patent ApplicationNos. 10-2016-0039438, filed on Mar. 31, 2016, and 10-2016-0126854, filedon Sep. 30, 2016, which are hereby incorporated by reference in theirentirety.

BACKGROUND 1. Field

The present disclosure relates to a wireless communication system and,more particularly, to a HARQ operation method, apparatus, software, orrecording medium storing software, which supports uplink datatransmission in a special subframe.

2. Discussion of the Background

A wireless communication system may support a Frequency Division Duplex(FDD) frame structure and a Time Division Duplex (TDD) frame structure.In the TDD frame structure, a single radio frame may include a subframefor a downlink (DL), a subframe for an uplink (UL), and a specialsubframe.

There is a need for various protocols and resource configurations forthe FDD and TDD frame structures to enhance more efficient allocation ofchannels and resources.

SUMMARY

The present disclosure provides a HARQ operation method and apparatusbased on a timing relationship between a PUSCH transmission and HARQfeedback information reception, which is defined for a TDD UL-DLconfiguration in order to support an uplink data transmission in aspecial subframe of a TDD frame structure.

An exemplary embodiment provides a method of transmitting a PhysicalUplink Shared Channel (PUSCH) in a special subframe by a User Equipment(UE), the method including: receiving an Uplink (UL) grant from a basestation, the UL grant being included in a downlink time period of TimeDivision Duplex (TDD) cell, wherein the TDD cell having TDD UL/DLconfiguration 1, 2 or 6; determining a resource in an Uplink Pilot TimeSlot (UpPTS) of a special subframe of the TDD cell to transmit a PUSCHassociated with the received UL grant, wherein the special subframe,having subframe number 1 or 6, consists of a Downlink Pilot Time Slot(DwPTS), a guard period (GP), and the UpPTS; transmitting, from the UE,the PUSCH mapped to the resource in the UpPTS; and receiving a PhysicalHybrid Automatic Repeat Request Indicator Channel (PHICH) responsive tothe PUSCH.

An exemplary embodiment provides a method of transmitting a PhysicalUplink Shared Channel (PUSCH) in a special subframe by a User Equipment(UE), the method including: receiving an Uplink (UL) grant from a basestation, the UL grant being included in a downlink time period of TimeDivision Duplex (TDD) cell; determining a resource in an Uplink PilotTime Slot (UpPTS) of a special subframe of the TDD cell to transmit aPUSCH associated with the received UL grant, wherein the specialsubframe, having subframe number 1, consists of a Downlink Pilot TimeSlot (DwPTS), a guard period (GP), and the UpPTS; transmitting, from theUE, the PUSCH mapped to the resource in the UpPTS; and receiving aPhysical Hybrid Automatic Repeat Request Indicator Channel (PHICH)responsive to the PUSCH. When the TDD cell having TDD UL/DLconfiguration 1 or 6, the UL grant was received in a downlink subframehaving subframe number 5, and when the TDD cell having TDD UL/DLconfiguration 2, the UL grant was received in a special subframe havingsubframe number 6.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a radio frame structureaccording to the present disclosure.

FIG. 2 through FIG. 10 are diagrams illustrating a HARQ timing capableof supporting a PUSCH transmission in a special subframe based on a TDDUL-DL configuration according to the present disclosure.

FIG. 11 is a diagram illustrating operations of a user equipment (UE)and an evolved node B (eNB) according to an embodiment of the presentdisclosure.

FIG. 12 is a diagram illustrating a UL transmission operation of a UEaccording to the present disclosure.

FIG. 13 is a diagram illustrating a configuration of a wireless deviceaccording to the present disclosure.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

FIG. 1 is a diagram illustrating an example of a radio frame structureaccording to the present disclosure. A frame structure as shown in FIG.1 may be referred to as frame structure type 2, and an FDD framestructure may be referred to as frame structure type 1. The example inFIG. 1 corresponds to a TDD frame structure assuming a 5 ms switch-pointperiod. Each radio frame has 10 subframes having subframe numbers 0, 1,2, . . . , 9, respectively. When n+k is greater than 9 and subframe n isincluded in radio frame M, subframe n+k is subframe n+k−10 of radioframe M+1. When n−k is negative integer value and subframe n is includedin radio frame M, subframe n−k is subframe n−k+10 of radio frame M−1.

A single radio frame is formed of two half-frames. The length of eachhalf-frame is 153600T_(s)=5 ms, and the length of a single radio frameis T_(f)=307200T_(s)=10 ms. Each half-frame may include five subframes.A subframe may be one of a DL subframe, a UL subframe, or a specialsubframe. A special subframe is formed of a DwPTS, a GP, and an UpPTS.The DwPTS is used for a DL transmission. The GP is a guard period forswitching from a DL to a UL. The UpPTS is used for a UL transmission. Inthe DwPTS, a DL data transmission, such as a PDSCH transmission, may besupported (e.g., special subframe configurations excluding specialsubframe configurations #0 and #5 in the case of a normal Cyclic Prefix(CP), and special subframe configurations excluding special subframeconfigurations #0 and #4 in the case of an extended CP in Table 1). Inthe UpPTS, UL data transmission is not allowed and only RS transmission,such as Sounding RS (SRS), is allowed.

Table 1 illustrates a special subframe configuration. Particularly,Table 1 includes the lengths of a DwPTS, a GP, and an UpPTS.

TABLE 1 Normal cyclic prefix in downlink Extended cyclic prefix indownlink UpPTS UpPTS Normal Extended Normal Extended Special subframecyclic prefix cyclic prefix cyclic prefix cyclic prefix configurationDwPTS in uplink in uplink DwPTS in uplink in uplink 0  6592 · T_(s) 2192· T_(s) 2560 · T_(s)  7680 · T_(s) 2192 · T_(s) 2560 · T_(s) 1 19760 ·T_(s) 20480 · T_(s) 2 21952 · T_(s) 23040 · T_(s) 3 24144 · T_(s) 25600· T_(s) 4 26336 · T_(s)  7680 · T_(s) 4384 · T_(s) 5120 · T_(s) 5  6592· T_(s) 4384 · T_(s) 5120 · T_(s) 20480 · T_(s) 6 19760 · T_(s) 23040 ·T_(s) 7 21952 · T_(s) 12800 · T_(s) 8 24144 · T_(s) — — — 9 13168 ·T_(s) — — —

A special subframe includes a Downlink Pilot Time Slot (DwPTS), a GuardPeriod (GP), and an Uplink Pilot Time Slot (UpPTS).

In a wireless communication system, a DL data transmission is allowed ina DwPTS, a UL data transmission is not allowed, and only a ReferenceSignal (RS) transmission is allowed in an UpPTS. In order to implementmethods for allowing a UL data transmission (e.g., Physical UplinkShared Channel (PUSCH) transmission) in a special subframe, thestructure of the special subframe illustrated in Table 1 may bemodified. In one or more embodiments, a detailed method for a new ULHybrid Automatic Repeat Request (UL HARQ) operation for supporting a ULdata transmission in a special subframe will be provided. According toten illustrative configurations as shown in Table 1, periods for theDwPTS, GP, and UpPTS may be defined for a normal CP or an extended CP.Table 1 is merely an example, and the present disclosure does notexclude adding a new special subframe configuration to the example inTable 1.

In the special subframe structure that the present disclosurerepresentatively assumes, the present disclosure considers allocatingsix OFDM symbols for a DwPTS, two OFDM symbols for a GP, and theremaining symbols for an UpPTS. Because the duration of one subframe is1 ms, which has 14 OFDM symbols for normal cyclic prefix, a UpPTS mayhave six OFDM symbols for normal cyclic prefix in uplink (or a UpPTS mayhave five OFDM symbols for extended cyclic prefix in uplink) when aDwPTS has six OFDM symbols (13168·Ts) for normal cyclic prefix indownlink as shown in Table 1 and a GP has two OFDM symbols.

Table 2 provided below illustrates a UL-DL configuration.

TABLE 2 Downlink- Uplink- to-Uplink downlink Switch-point Subframenumber configuration periodicity 0 1 2 3 4 5 6 7 8 9 0 5 ms D S U U U DS U U U 1 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms  DS U U U D D D D D 4 10 ms  D S U U D D D D D D 5 10 ms  D S U D D D D DD D 6 5 ms D S U U U D S U U D

Table 2 illustrates a type of subframe (i.e., a DL, a UL, or a specialsubframe) set for each of the ten subframes of a single radio frame. Ddenotes a DL subframe, U denotes a UL subframe, and S denotes a specialsubframe. The ratio of D, U, and S in a single radio frame may bedifferent according to the UL-DL configuration. A configuration may beindicated to terminals in a cell by semi-static signaling (e.g., higherlayer signaling, such as System Information Block (SIB) signaling orRadio Resource Control (RRC) signaling). In the case of user equipment(UE) to which an enhanced Interference Mitigation and Traffic Adaptation(eIMTA) function is set, a UL-DL configuration as described above may beindicated by a Downlink Control Information (DCI) format IC that isscrambled using dynamic signaling (e.g., a Radio Network TemporaryIdentifier (eIMTA-RNTI)).

To support a UL PUSCH transmission in a special subframe, a mechanismfor the special subframe includes a DwPTS occupying six OrthogonalFrequency Division Multiplexing (OFDM) symbols and a GP occupying twoOFDM symbols; radio frequency (RF) requirements are determined for thesame; and compatibility with a UE that does not support UL datatransmission in a special subframe needs to be provided.

As described above, to support a UE's PUSCH transmission in a specialsubframe in a TDD serving cell, new UL HARQ timing needs to be defined.Hereinafter the present disclosure will describe a new HARQ timing for aPUSCH transmission in a special subframe according to a TDD UL-DLconfiguration, as well as a DCI format configuration and signalingmethod for supporting the same.

FIG. 2 through FIG. 10 are diagrams illustrating a HARQ timing capableof supporting a PUSCH transmission in a special subframe based on a TDDUL-DL configuration according to the present disclosure.

Hereinafter, the following expressions are defined for ease ofdescription.

G: denotes uplink (UL) grant. The UL grant may be included in DCI format0 or DCI format 4 transmitted through a Physical Downlink ControlChannel (PDCCH) or an Enhanced PDCCH (EPDCCH).

P: denotes a Physical HARQ Indicator Channel (PHICH) that deliversHARQ-ACK information transmitted in response to UL data. G (UL grant)may be transmitted in a subframe in which P (PHICH) is transmitted.

U: denotes an initial PUSCH transmission.

R: denotes a retransmission of a PUSCH.

D: denotes a DL subframe.

U: denotes a UL subframe.

S: denotes a special subframe.

RF: denotes a radio frame.

HARQ process #X-Y: X denotes a HARQ process number and Y denotes amethod of the corresponding HARQ process number. That is, the presentdisclosure defines one or more methods for a single HARQ process number.

A HARQ operation according to the present disclosure may have adifferent HARQ period based on a TDD UL-DL configuration and thesettings of normal HARQ operation. Descriptions will be provided byassuming that a HARQ period is 70 ms in TDD UL-DL configuration #0; theHARQ period is 60 ms in TDD UL-DL configuration #6; and the HARQ periodis 20 ms in TDD UL-DL configurations #1-5.

Also, in the present disclosure, I_(PHICH) is an index fordistinguishing different PHICH resources in the same subframe on thesame serving cell, which is associated with HARQ timing. That is, in arelationship between a PUSCH and a PHICH defined by HARQ timing proposedin the present disclosure, I_(PHICH) is used for determining a PHICHresource in a subframe in which a PHICH is transmitted after a PUSCHtransmission performed in a predetermined subframe. Therefore, I_(PHICH)is defined according to a subframe in which a PUSCH is transmitted inthe relationship between a PUSCH and a PHICH, and may be taken intoconsideration for determining transmission timings of a PHICH and aretransmission PUSCH.

For example, referring to FIG. 2 of the present disclosure, according toTDD UL-DL configuration #0, the I_(PHICH) index for a PHICH associatedwith a PUSCH transmitted in a subframe 1 has a value of 1. A PHICHhaving the I_(PHICH) index of 1 is transmitted in a subframe 6(embodiment 1-1, based on n+5) and an associated PUSCH retransmission isexecuted in a subframe 1 (embodiment 1-1, based on n+5) in a subsequentradio frame.

Hereinafter, all uplink HARQ timing values are designed in a way(backward compatibility) that least affects existing UEs. The uplinkHARQ timing values are designed to provide: a lower HARQ delay time(uplink transmission and retransmission timing of a UE) to maximizeuplink data transmission rates of new UEs capable of performing anuplink transmission in a special subframe; the least effect to the sizeof DCI formats 0 or 4; PHICH resource collision avoidance; and the like.

Embodiment 1

The present embodiment 1 illustrates an example of TDD UL-DLconfiguration #0 and normal HARQ operation.

FIG. 2 illustrates a UL grant PUSCH-PHICH timing relationship in a 70 msHARQ period in a special subframe (S) according to TDD UL-DLconfiguration #0. Processes #2, 3, 4, 5, 6, 7, and 1 are TDD HARQprocesses for reference, and HARQ processes #8-1, 9-1, 8-2, and 9-2correspond to new HARQ timings proposed in the present disclosure.

In TDD UL-DL configuration #0 and with normal HARQ operation, the newHARQ processes #8-1 and 8-2 are different methods (options) for subframe#1 (S). Also, HARQ processes #9-1 and 9-2 are different methods(options) for subframe #6 (S).

Embodiment 1-1

The present embodiment 1-1 relates to HARQ process #8-1 or HARQ process#9-1.

In this section, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #0 and with normal HARQ operation, thefollowing timing is provided. Hereinafter, the timing of a PUSCHtransmission subframe will be described based on a subframe n in whichone or more of a UL grant (G) and a PHICH (P) is received.

In one example, a PUSCH transmission is performed in a subframe n+k. Tothis end, the Most Significant Bit (MSB) of a UL index field which isdefined by 3 bits in DCI format 0 or 4 may be set to 1, or a PHICHcorresponding to I_(PHICH)=0 may be received in a subframe 0 or 5. Here,k may be defined as listed in Table 3 provided below. Alternatively, aPUSCH transmission may be performed in a subframe n+k. To this end, theMost Significant Bit (MSB) of a UL index field which is defined by 2bits in DCI format 0 or 4 may be set to 1, or a PHICH corresponding toI_(PHICH)=0 may be received in a subframe 0 or 5. Here, k may be definedas listed in Table 3 provided below.

TABLE 3 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 04 6 4 6

In another example, a PUSCH transmission may be performed in a subframen+7. To this end, the Least Significant Bit (LSB) of a UL index fieldwhich is defined by 3 bits in DCI format 0 or 4 may be set to 1, a PHICHcorresponding to I_(PHICH)=1 may be received in a subframe 0 or 5, or aPHICH corresponding to I_(PHICH)=0 may be received in a subframe 1 or 6.Alternatively, a PUSCH transmission may be performed in a subframe n+7.To this end, the Least Significant Bit (LSB) of a UL index field whichis defined by 2 bits in DCI format 0 or 4 may be set to 1, a PHICHcorresponding to I_(PHICH)=1 may be received in a subframe 0 or 5, or aPHICH corresponding to I_(PHICH)=0 may be received in a subframe 1 or 6.

In another example, a PUSCH transmission may be performed in a subframen+5. To this end, the value of a middle bit excluding the MSB and theLSB of a UL index field which is defined by 3 bits in DCI format 0 or 4may be set to 1, or a PHICH corresponding to I_(PHICH)=1 may be receivedin a subframe 1 or 6. Alternatively, when a UE receives an (E)PDCCHincluding DCI format 0 or 4 in a subframe n=1 or n=6, a PUSCHtransmission may be performed in a subframe n+5. To indicate the same,the MSB bit value and the LSB bit value of a UL index field which isdefined by 2 bits in DCI format 0 or 4 may be set to 0, or a PHICHcorresponding to I_(PHICH)=1 may be received in a subframe 1 or 6.

A method of utilizing a 2-bit UL index in DCI format 0 or 4 does notincrease the total number of bits of the DCI format 0 or 4 when comparedto a method of using 3 bits. Accordingly, a more reliable (E)PDCCHdetection may be provided to a UE, which is an advantage.

For the above examples, in the case of TDD UL-DL configuration 0 withPUSCH transmission in subframe n=1, 4, 6 or 9, I_(PHICH) may be 1.Otherwise, I_(PHICH) may be 0.

For example, as illustrated in FIG. 2 , a UE may receive at least one ULgrant 201, 202, and 203 indicating three PUSCH transmission timings inthe subframe 6 of radio frame #0. When the MSB of the UL grant UL indexfield 201, 202, and 203 is set to 1, a transmission timing n (subframe6)+k (k determined based on Table 3 is 6) 211 is determined as a PUSCHtransmission timing n+k (Table 3) with respect to the UL grant 201.

Additionally or alternatively, when the LSB of the UL grant UL indexfield 202 is set to 1, a PUSCH transmission timing is n+7 212.

Additionally or alternatively, when a bit remaining after excluding theMSB/LSB of the UL index field in the UL grant 203 is set to 1, or whenboth of the MSB/LSB bits of the UL index field of the UL grant 203 areset to 0, a PUSCH transmission timing is n+5 213.

From the perspective of a PHICH, when a PHICH corresponding toI_(PHICH)=0 is received in a subframe 6 in the diagram 204, atransmission timing n (subframe 6)+k (k determined based on Table 3 is7) 214 is determined as a PUSCH transmission timing associated with thePHICH based on n+k (Table 3). Additionally or alternatively, when aPHICH corresponding to I_(PHICH)=1 is received in a subframe 6 in thediagram 205, a PUSCH transmission timing associated with the PHICH maybe n+5 215. Additionally or alternatively, when a PHICH corresponding toI_(PHICH)=2 is received in a subframe 0 or 5 in diagrams 220 and 221, aPUSCH transmission timing associated with the PHICH may be n+4.

Hereinafter, the timing of a subframe (k) associated with a UL grant(G), a PHICH (P), a PUSCH transmission (U), and a retransmission (R) ofthe PUSCH may be applied in the same or a similar method as describedabove according to the following corresponding condition (and definedtable). When a UE receives an (E)PDCCH that has a 3-bit UL index fieldof which a value in DCI format 0 or 4 is set to “111” in a subframe n,PUSCH transmissions may be performed in the subframe n+k, the subframen+7, and the subframe n+5 of the above examples.

Alternatively, when a UL index field is defined by 2 bits instead of 3bits, a UE may receive at least one UL grant 201, 202, and 203 whichindicates three PUSCH transmission timings in subframe 6 of radio frame#0, as illustrated in FIG. 2 . When the MSB of the UL index field in theUL grant 201 is set to 1, a PUSCH transmission timing is n+k (based onTable 3). Additionally or alternatively, when the LSB of the UL indexfield of the UL grant 202 is set to 1, a PUSCH transmission timing isn+7. Additionally or alternatively, when the MSB/LSB of the UL indexfield in the UL grant 203 is set to 0 in a subframe n=1 or 6, a PUSCHtransmission timing is n+5 as shown in the proposed HARQ process #8-1 orHARQ process #9-1.

When a UE receives an (E)PDCCH that has a 2-bit UL index field of whicha value in DCI format 0 or 4 is set to “11” in a subframe n, PUSCHtransmissions may be performed in the subframe n+k, the subframe n+7,and the subframe n+5 (existing only when subframe n=1 or n=6) of theabove examples. Alternatively, PUSCH transmissions may be performed inonly the subframe n+k and the subframe n+7 (excluding the subframe n+5).

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, anevolved Node B (eNB) may perform a PHICH transmission through a servingcell where a UL grant has been transmitted in a subframe n+k_(PHICH).This transmission may proceed through a serving cell c in the case of aself-carrier scheduling and through another serving cell in the case ofa cross-carrier scheduling if Carrier Aggregation (CA) is applied. Here,k_(PHICH) may be defined as listed in Table 4 provided below. Accordingto this method, PHICH transmission timings are evenly distributed todownlink subframes or to special subframes (DwPTS) capable of performinga downlink transmission in a single radio frame, and thus, a balancedPHICH resource configuration may be provided to a new TDD UE.

TABLE 4 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 0 54 7 6 5 4 7 6

In another PHICH transmission timing method, a new k_(PHICH) value maybe defined as shown in Table 5 and FIG. 3 so as to perform a PHICHtransmission in a downlink subframe where a PHICH resource area alreadyexists. By separating a PHICH transmission timing associated with aretransmission from a UL grant transmission timing, an uplink datascheduling of an eNB may be flexibly embodied.

TABLE 5 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 0 44 7 6 4 4 7 6

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

In one example, a PHICH in a resource corresponding to I_(PHICH)=0(which is allocated to a UE in a subframe i in TDD UL-DL configuration0) is associated with a PUSCH transmission in a subframe i-k. Here, kmay be defined as listed in Table 6 provided below.

TABLE 6 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 07 4 7 4

In another example, in the case of a subframe i=0 or 5 for TDD UL-DLconfiguration 0, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in the subframe i) is associated with aPUSCH transmission in a subframe i-6.

In another example, in the case of a subframe i=0 or 5 for TDD UL-DLconfiguration 0, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in the subframe i) is associated with aPUSCH transmission in a subframe i-6, and a PHICH in a resourcecorresponding to I_(PHICH)=2 is associated with a PUSCH transmission ina subframe i-4.

In another example, in the case of a subframe i=1 or 6 for TDD UL-DLconfiguration 0, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in the subframe i) is associated with aPUSCH transmission in a subframe i-5.

Embodiment 1-2

Embodiment 1-2 relates to HARQ process #8-2 or HARQ process #9-2.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #0 and with normal HARQ operation, thefollowing timing is provided. Hereinafter, the timing of a PUSCHtransmission subframe will be described based on a subframe n in whichone or more of a UL grant (G) and a PHICH (P) is received.

In one example, a PUSCH transmission is performed in a subframe n+k. Tothis end, the MSB of a UL index field which is defined by 3 bits in DCIformat 0 or 4 may be set to 1, or a PHICH corresponding to I_(PHICH)=0may be received in a subframe 0 or 5. Here, k may be defined as listedin Table 3 provided below.

In another example, a PUSCH transmission may be performed in a subframen+7. To this end, the LSB of a UL index field which is defined by 3 bitsin DCI format 0 or 4 may be set to 1, a PHICH corresponding toI_(PHICH)=1 may be received in a subframe 0 or 5, or a PHICH may bereceived in a subframe 1 or 6.

In another example, a PUSCH transmission may be performed in a subframen+6. To this end, the value of a middle bit excluding the MSB and theLSB of a UL index field (which is defined by 3 bits in DCI format 0 or4) may be set to 1, or a PHICH corresponding to I_(PHICH)=2 may bereceived in a subframe 0 or 5.

In the above described embodiments, the I_(PHICH) value is 1 in the caseof TDD UL-DL configuration 0 with PUSCH transmission in subframe n=4 or9 and the I_(PHICH) value is 2 in the case of TDD UL-DL configuration 0with PUSCH transmission in subframe n=1 or 6. Otherwise, the I_(PHICH)value is 0.

Unlike embodiment 1-1, three PHICH groups may be generated in a singlesubframe. Therefore, I_(PHICH) may have a value of 0, 1, or 2, and aPHICH resource allocation may be performed based on the I_(PHICH) value.

When a UE receives an (E)PDCCH that has a 3-bit UL index field of whicha value in DCI format 0 or 4 is set to “111” in a subframe n, PUSCHtransmissions may be performed in the subframe n+k, the subframe n+7,and the subframe n+6 of the above examples.

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 7provided below.

TABLE 7 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 0 44 7 6 4 4 7 6

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

In one example, a PHICH in a resource corresponding to I_(PHICH)=0(which is allocated to a UE in a subframe i for TDD UL-DL configuration0) is associated with a PUSCH transmission in a subframe i-k. Here, kmay be defined as listed in Table 8 provided below.

TABLE 8 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 07 4 7 4

In another example, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in a subframe i for TDD UL-DL configuration0) is associated with a PUSCH transmission in a subframe i-6.

In another example, a PHICH in a resource corresponding to I_(PHICH)=2(which is allocated to a UE in a subframe i for TDD UL-DL configuration0) is associated with a PUSCH transmission in a subframe i-4.

Embodiment 1-3

Embodiment 1-3 relates to HARQ processes #8-1 and 8-2 and HARQ processes#9-1 and 9-2. That is, the embodiment 1-3 is a method of utilizing allof the proposed HARQ processes. A difference from the above describedembodiments is that a 2-bit UL index field defined in DCI format 0 or 4is used and an eNB indicates a PUSCH transmission timing to a UE throughadditional interpretation.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #0 and normal HARQ operation, the followingtiming is provided. Hereinafter, the timing of a PUSCH transmissionsubframe will be described based on a subframe n in which one or both ofa UL grant (G) and a PHICH (P) is received.

In one example, a PUSCH transmission is performed in a subframe n+k. Tothis end, the MSB of a UL index field which is defined by 2 bits in DCIformat 0 or 4 may be set to 1, or a PHICH corresponding to I_(PHICH)=0may be received in a subframe 0 or 5. Here, k may be defined as listedin Table 3 provided below.

In another example, a PUSCH transmission may be performed in a subframen+7. To this end, the LSB of a UL index field which is defined by 2 bitsin DCI format 0 or 4 may be set to 1, a PHICH corresponding toI_(PHICH)=1 may be received in a subframe 0 or 5, or a PHICH may bereceived in a subframe 1 or 6.

In another example, when DCI format 0 or 4 corresponding to the UL grantis received in a subframe n=0 or 5 (like HARQ processes #8-2 and #9-2 inFIG. 2 ), a PUSCH transmission may be performed in a subframe n+6. Asanother example, when the DCI format 0 or 4 corresponding to the ULgrant is received in a subframe n=1 or 6 (like HARQ processes #8-1 and#9-1 in FIG. 2 ), a PUSCH transmission may be performed in a subframen+5. To this end, the MSB and the LSB of a UL index field which isdefined by 2 bits in DCI format 0 or 4 may be set to 0, or a PHICHcorresponding to I_(PHICH)=2 may be received in a subframe 0 or 5.

In the above described embodiments, an I_(PHICH) value is 1 in the caseof TDD UL-DL configuration 0 with PUSCH transmission in subframe n=4 or9, and the I_(PHICH) value is 2 in the case of TDD UL-DL configuration 0with PUSCH transmission in subframe n=1 or 6. Otherwise, the I_(PHICH)value is 0.

Unlike the embodiment 1-1, three PHICH groups may be generated in asingle subframe. Therefore, I_(PHICH) may have a value of 0, 1, or 2,and PHICH resource allocation may be performed based on the I_(PHICH)value.

When a UE receives an (E)PDCCH that has a 2-bit UL index field of whicha value in DCI format 0 or 4 is set to “11” in a subframe n, PUSCHtransmissions may be performed in the subframe n+k and the subframe n+7(and the subframe n+6 or the subframe n+5) of the above examples. Forexample, in the case of a subframe n=0 or n=5, PUSCH transmissions maybe performed in subframes n+k, n+7, and n+6. In the case of a subframen=1 or n=6, PUSCH transmissions may be performed in subframes n+k, n+7,and n+5. Conversely, according to the conventional method, when a UEreceives an (E)PDCCH that has a 2-bit UL index field of which a value inDCI format 0 or 4 is set to “11” in a subframe n, PUSCH transmissionsmay be performed in only the subframe n+k and the subframe n+7(excluding the subframes n+5, and n+6).

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 9provided below. The method provides a new TDD UE with a larger number ofPHICH transmission timings than the other methods proposed above, indownlink subframes or special subframes (DwPTS) capable of transmittinga downlink transmission in a single radio frame, thereby providing aflexible PHICH resource indication and raising the data transmissionrate.

TABLE 9 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 0 4or 5 4 7 6 4 or 5 4 7 6

In a PUSCH transmission subframe 1 or 6,

-   -   when a UL grant transmission indicating a PUSCH transmission in        a subframe 1 or 6 is a subframe 6, k_(PHICH) is 5.    -   when a UL grant transmission indicating a PUSCH transmission in        a subframe 1 or 6 is a subframe 5, k_(PHICH) is 4.

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

In one example, a PHICH in a resource corresponding to I_(PHICH)=0(which is allocated to a UE in a subframe i for TDD UL-DL configuration0) is associated with a PUSCH transmission in a subframe i-k. Here, kmay be defined as listed in Table 6 provided below.

In another example, in the case of a subframe i=0 or 5 for TDD UL-DLconfiguration 0, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in the subframe i) is associated with aPUSCH transmission in a subframe i-6.

In another example, in the case of a subframe i=0 or 5 for TDD UL-DLconfiguration 0, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in the subframe i) is associated with aPUSCH transmission in a subframe i-6, and a PHICH in a resourcecorresponding to I_(PHICH)=2 is associated with a PUSCH transmission ina subframe i-4.

Embodiment 2

The present embodiment 2 is an example associated with TDD UL-DLconfiguration #1 and normal HARQ operation.

FIG. 4 illustrates a UL Grant-PUSCH-PHICH timing relationship in a 20 msHARQ period in a special subframe (S), in TDD UL-DL configuration #1.Processes #1, 2, 3, and 4 are TDD HARQ processes, and HARQ processes #5and 6 correspond to new HARQ timings. Several examples of the presentdisclosure will be described in association with HARQ processes #5 and 6in TDD UL-DL configuration #1 and with normal HARQ operation.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #1 and normal HARQ operation, the followingtiming is provided. The timing of a PUSCH transmission subframe will bedescribed based on a subframe n in which one or both of a UL grant (G)and a PHICH (P) is received.

For example, a PUSCH transmission may be performed in a subframe n+k. Inthe timing relationship in TDD UL-DL configuration #1, k may be definedby Table 10 provided below.

TABLE 10 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 16 6 4 6 6 4

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 11provided below.

TABLE 11 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 14 4 6 4 4 6

As another PHICH transmission timing method, a new k_(PHICH) value maybe defined as shown in Table 12 and FIG. 5 so as to perform a PHICHtransmission in a downlink subframe where a PHICH resource area alreadyexists. The proposed method enables new UEs to utilize subframes, whichinclude PHICH resources and which have been defined for existing UEs,and thus, may avoid handling issues associated with backwardcompatibility, unlike the method that defines a new PHICH area.

TABLE 12 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 15 4 6 5 4 6

Hereinafter, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

For example, a PHICH in a resource corresponding to I_(PHICH)=0 (whichis allocated to a UE in a subframe i for TDD UL-DL configuration #1) maybe associated with a PUSCH transmission in a subframe i-k. Here, k maybe defined as listed in Table 13 provided below.

TABLE 13 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 14 4 6 4 4 6

In a method corresponding to the PHICH transmission timing method basedon Table 12, a previous PUSCH subframe i-k associated with a PHICHtransmission may be defined by the table provided below.

TABLE 14 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 14 or 5 6 4 or 5 6

In Table 14, k in a subframe 1 may be defined as below. In the case of aPHICH transmission with respect to a PUSCH transmission in a subframe 7,k=4. In the case of a PHICH transmission with respect to a PUSCHtransmission in a subframe 6, k=5.

In Table 14, k in a subframe 6 may be defined as below. In the case of aPHICH transmission with respect to a PUSCH transmission in a subframe 2,k=4. In the case of a PHICH transmission with respect to a PUSCHtransmission in a subframe 1, k=5.

Embodiment 3

The present embodiment 3 is an example associated with TDD UL-DLconfiguration #2 and normal HARQ operation.

FIG. 6 illustrates a UL Grant-PUSCH-PHICH timing relationship in a 20 msHARQ period in a special subframe (S), in TDD UL-DL configuration #2.Processes #1 and 2 are TDD HARQ processes, and HARQ processes #3-1, 3-2,4-1, and 4-2 correspond to new HARQ timings proposed in the presentdisclosure. Several examples of the present disclosure will be describedin association with HARQ processes #3-1, 3-2, 4-1, and 4-2 in TDD UL-DLconfiguration #2 and normal HARQ operation.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #2 and normal HARQ operation, the followingtiming is provided. The timing of a PUSCH transmission subframe will bedescribed based on a subframe n in which one or both of a UL grant (G)and a PHICH (P) is received.

For example, a PUSCH transmission may be performed in a subframe n+k. Inthe timing relationship in TDD UL-DL configuration #2, k may be definedby Tables 15 and 16 provided below. The timing relationship in Table 15may be applied to HARQ processes #3-1 or 4-1 in the present disclosure.The timing relationship in table 16 may be applied to HARQ processes#3-2 or 4-2 in the present disclosure.

TABLE 15 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 26 4 6 4

TABLE 16 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 25 4 5 4

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 17 orTable 18 provided below. Table 17 may be applied to HARQ processes #3-1or 4-1 in the present disclosure. Table 18 may be applied to HARQprocesses #3-2 or 4-2 in the present disclosure.

TABLE 17 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 24 6 4 6

TABLE 18 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 25 6 5 6

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

For example, a PHICH in a resource corresponding to I_(PHICH)=0 (whichis allocated to a UE in a subframe i for TDD UL-DL configuration #2) maybe associated with a PUSCH transmission in a subframe i-k. Here, k maybe defined as listed in Table 19 or Table 20 provided below. Table 19may be applied to HARQ processes #3-1 or 4-1 in the present disclosure,and Table 20 may be applied to HARQ processes #3-2 or 4-2 in the presentdisclosure.

TABLE 19 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 24 6 4 6

TABLE 20 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 25 6 5 6

Embodiment 4

The present embodiment 4 is an example associated with TDD UL-DLconfiguration #3 and normal HARQ operation.

FIG. 7 illustrates a UL Grant-PUSCH-PHICH timing relationship in a 20 msHARQ period in a special subframe (S), in TDD UL-DL configuration #3.Processes #1, 2, and 3 are TDD HARQ processes, and HARQ processes #4-1,4-2, and 4-3 correspond to new HARQ timings. Several examples of thepresent disclosure will be described in association with HARQ processes#4-1, 4-2, and 4-3 in TDD UL-DL configuration #3 and normal HARQoperation.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #3 and normal HARQ operation, the followingtiming is provided. Hereinafter, the timing of a PUSCH transmissionsubframe will be described based on a subframe n in which one or both ofa UL grant (G) and a PHICH (P) is received.

For example, a PUSCH transmission may be performed in a subframe n+k. Inthe timing relationship in TDD UL-DL configuration #3, k may be definedby Tables 21, 22, or 23 provided below. That is, three methods (options)may be applied to a single HARQ process.

The timing relationship shown in Table 21 may be applied to HARQ process#4-1 of the present disclosure. The timing relationship shown in Table22 may be applied to HARQ process #4-2 of the present disclosure. Thetiming relationship shown in Table 23 may be applied to HARQ process#4-3 of the present disclosure.

TABLE 21 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 34 4 4 4

TABLE 22 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 34 5 4 4

TABLE 23 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 34 6 4 4

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 24,Table 25, or Table 26 provided below. Table 24 may be applied to HARQprocess #4-1 of the present disclosure. Table 25 may be applied to HARQprocess #4-2 of the present disclosure. Table 26 may be applied to HARQprocess #4-3 of the present disclosure.

TABLE 24 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 36 6 6 6

TABLE 25 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 35 6 6 6

TABLE 26 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 34 6 6 6

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

For example, a PHICH in a resource corresponding to I_(PHICH)=0 (whichis allocated to a UE in a subframe i for TDD UL-DL configuration #3) maybe associated with a PUSCH transmission in a subframe i-k. Here,k_(PHICH) may be defined as listed in Table 27, Table 28, or Table 29provided below. Table 27 may be applied to HARQ process #4-1 of thepresent disclosure. Table 28 may be applied to HARQ process #4-2 of thepresent disclosure. Table 29 may be applied to HARQ process #4-3 of thepresent disclosure.

TABLE 27 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 36 6 6 6

TABLE 28 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 36 5 6 6

TABLE 29 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 36 4 6 6

Embodiment 5

The present embodiment 5 is an example associated with TDD UL-DLconfiguration #4 and normal HARQ operation.

FIG. 8 illustrates a UL Grant-PUSCH-PHICH timing relationship in a 20 msHARQ period in a special subframe (S), in TDD UL-DL configuration #4.Processes #1 and 2 are TDD HARQ processes for reference, and HARQprocesses #3-1, 3-2, and 3-3 correspond to new HARQ timings proposed inthe present disclosure. Hereinafter, examples of the present disclosurewill be described in association with HARQ processes #3-1, 3-2, and 3-3in TDD UL-DL configuration #4 and normal HARQ operation.

Hereinafter, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #4 and normal HARQ operation, the followingtiming is provided. The timing of a PUSCH transmission subframe will bedescribed based on a subframe n in which one or both of a UL grant (G)and a PHICH (P) is received.

For example, a PUSCH transmission may be performed in a subframe n+k. Inthe timing relationship in TDD UL-DL configuration #4, k may be definedby Tables 30, 31, or 32 provided below. That is, three methods (options)may be applied to a single HARQ process.

The timing relationship shown in Table 30 may be applied to HARQ process#3-1 of the present disclosure. The timing relationship shown in Table31 may be applied to HARQ process #3-2 of the present disclosure. Thetiming relationship shown in Table 32 may be applied to HARQ process#3-3 of the present disclosure.

TABLE 30 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 8 44 4 4

TABLE 31 TDD ULDL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 45 4 4

TABLE 32 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 46 4 4

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 33,Table 34, or Table 35 provided below. Table 33 may be applied to HARQprocess #3-1 of the present disclosure. Table 34 may be applied to HARQprocess #3-2 of the present disclosure. Table 35 may be applied to HARQprocess #3-3 of the present disclosure.

TABLE 33 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 46 6 6

TABLE 34 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 45 6 6

TABLE 35 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 44 6 6

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

In one example, a PHICH in a resource corresponding to I_(PHICH)=0(which is allocated to a UE in a subframe i for TDD UL-DL configuration#4) may be associated with a PUSCH transmission in a subframe i-k. Here,k_(PHICH) may be defined as listed in Table 36, Table 37, or Table 38provided below. Table 36 may be applied to HARQ process #3-1 of thepresent disclosure. Table 37 may be applied to HARQ process #3-2 of thepresent disclosure. Table 38 may be applied to HARQ process #3-3 of thepresent disclosure.

TABLE 36 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 46 6 6

TABLE 37 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 45 6 6

TABLE 38 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 44 6 6

Embodiment 6

The present embodiment 6 is an example associated with TDD UL-DLconfiguration #5 and normal HARQ operation.

FIG. 9 illustrates a UL Grant-PUSCH-PHICH timing relationship in a 20 msHARQ period in a special subframe (S), in TDD UL-DL configuration #5.Process #1 is a TDD HARQ process, and HARQ processes #2-1, 2-2, and 2-3correspond to new HARQ timings proposed in the present disclosure.Several examples of the present disclosure will be described inassociation with HARQ processes #2-1, 2-2, and 2-3 in TDD UL-DLconfiguration #5 and normal HARQ operation.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #5 and normal HARQ operation, the followingtiming is provided. The timing of a PUSCH transmission subframe will bedescribed based on a subframe n in which one or both of a UL grant (G)and a PHICH (P) is received.

For example, a PUSCH transmission may be performed in a subframe n+k. Inthe timing relationship in TDD UL-DL configuration #5, k may be definedby Tables 39, 40, or 41 provided below. That is, three methods (options)may be applied to a single HARQ process.

The timing relationship shown in Table 39 may be applied to HARQ process#2-1 of the present disclosure. The timing relationship shown in Table40 may be applied to HARQ process #2-2 of the present disclosure. Thetiming relationship shown in Table 41 may be applied to HARQ process#2-3 of the present disclosure.

TABLE 39 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 54 4

TABLE 40 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 55 4

TABLE 41 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 56 4

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 42,Table 43, or Table 44 provided below. Table 42 may be applied to HARQprocess #2-1 of the present disclosure. Table 43 may be applied to HARQprocess #2-2 of the present disclosure. Table 44 may be applied to HARQprocess #2-3 of the present disclosure.

TABLE 42 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 56 6

TABLE 43 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 55 6

TABLE 44 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 54 6

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

For example, a PHICH in a resource which is allocated to a UE in asubframe i for TDD UL-DL configuration #5, may be associated with aPUSCH transmission in a subframe i-k. Here, k_(PHICH) may be defined aslisted in Table 45, Table 46, or Table 47 provided below. Table 45 maybe applied to HARQ process #2-1 of the present disclosure. Table 46 maybe applied to HARQ process #2-2 of the present disclosure. Table 47 maybe applied to HARQ process #2-3 of the present disclosure.

TABLE 45 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 56 6

TABLE 46 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 55 6

TABLE 47 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 54 6

Embodiment 7

The present embodiment 7 is an example associated with TDD UL-DLconfiguration #6 and normal HARQ operation.

FIG. 10 illustrates a UL Grant-PUSCH-PHICH timing relationship in a 60ms HARQ period in a special subframe (S), in TDD UL-DL configuration #6.Processes #1, 2, 3, 4, 5, and 6 are TDD HARQ processes for reference,and HARQ processes #7-1, 7-2, 8-1, and 8-2 correspond to new HARQtimings proposed in the present disclosure.

In TDD UL-DL configuration #6 and normal HARQ operation, the new HARQprocesses #7-1 and 7-2 are different methods (options) for a subframe #1(S). Also, HARQ processes #8-1 and 8-2 are different methods (options)for a subframe #6 (S).

Hereinafter, a UL index field mentioned in embodiment 7-1 and 7-2 may bereplaced with a Downlink Assignment Indication (DAI) field. That is,uplink PUSCH transmission timing may be indicated using a 2-bit DAIfield, without using a UL index field. Therefore, in this instance, the2-bit DAI field exists but the UL index field may not exist in DCIformat 0 or 4.

Embodiment 7-1

The present embodiment 7-1 relates to HARQ processes #7-1 or #8-1.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #6 and normal HARQ operation, the followingtiming is provided. The timing of a PUSCH transmission subframe will bedescribed based on a subframe n in which one or both of a UL grant (G)and a PHICH (P) is received.

Table 48 provided below illustrates a method of indicating new PUSCHtransmission timing (special subframe) in TDD UL-DL configuration #6.

TABLE 48 PUSCH transmission timing corresponding UL Index (DAI) field (2bits) to (E)PDCCH received in subframe n MSB = 1 0 (n + k) LSB = 1 1(n + 6) MSB = 1 and LSB = 1 2 (n + k and n + 6) — —

In one example, a PUSCH transmission may be performed in a subframe n+k.To this end, the MSB of a UL index field which is defined by 2 bits inDCI format 0 or 4 may be set to 1, or a PHICH corresponding toI_(PHICH)=0 may be received in a subframe 0 or 5. Here, k may be definedas listed in Table 49 provided below.

TABLE 49 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 67 7 7 7 5

In another example, a PUSCH transmission may be performed in a subframen+6. To this end, the LSB of a UL index field which is defined by 2 bitsin DCI format 0 or 4 may be set to 1, or a PHICH corresponding toI_(PHICH)=1 may be received in a subframe 0 or 5.

In the above examples, I_(PHICH) may be 1 in the case of TDD UL-DLconfiguration #6 with PUSCH transmission in subframe n=1 or 6.Otherwise, I_(PHICH) may be 0.

When a UE receives an (E)PDCCH that has a 2-bit UL index field of whicha value in DCI format 0 or 4 is set to “11” in a subframe n, PUSCHtransmissions may be performed in both of the subframe n+k and thesubframe n+6 of the above examples.

In another example, a PUSCH transmission may be performed in a subframen+k. To this end, the value of a UL index (DAI) field which is definedby 2 bits in DCI format 0 or 4 may be set to 0, or a PHICH correspondingto I_(PHICH)=0 may be received in a subframe 0 or 5. Here, k may bedefined as listed in Table 49 provided below.

In another example, a PUSCH transmission may be performed in a subframen+6. To this end, the value of a UL index (DAI) field which is definedby 2 bits in DCI format 0 or 4 may be set to 1, or a PHICH correspondingto I_(PHICH)=1 may be received in a subframe 0 or 5.

When a UE receives an (E)PDCCH that has a 2-bit UL index (DAI) field ofwhich a value in DCI format 0 or 4 is set to 2 (“10”), in a subframe n,PUSCH transmissions may be performed in both of the subframe n+k and thesubframe n+6 of the above examples.

Table 50 provided below illustrates a method of indicating a new PUSCHtransmission timing (special subframe) in TDD UL-DL configuration #6.

TABLE 50 PUSCH transmission timing corresponding UL Index (DAI) field (2bits) to (E)PDCCH received in subframe n 00 0 (n + k) 01 1 (n + 6) 10 2(n + k and n + 6) 11 —

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 51provided below.

TABLE 51 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 64 4 6 6 4 4 7

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

In one example, a PHICH in a resource corresponding to I_(PHICH)=0(which is allocated to a UE in a subframe i for TDD UL-DL configuration#6) may be associated with a PUSCH transmission in a subframe i-k. Here,k may be defined as listed in Table 52 provided below.

TABLE 52 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 66 4 7 4 6

In another example, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in a subframe i for TDD UL-DL configuration#6) is associated with a PUSCH transmission in a subframe i-4.

Embodiment 7-2

The present embodiment 7-2 relates to HARQ processes #7-2 or #8-2.

Next, a UL Grant-PUSCH timing relationship will be described.

In TDD UL-DL configuration #6 and normal HARQ operation, the followingtiming is provided. The timing of a PUSCH transmission subframe will bedescribed based on a subframe n in which one or both of a UL grant (G)and a PHICH (P) is received. Each timing value provided below may beindicated by a predetermined field in a UL grant as shown in Table 53 or54.

Tables 53 and 54 provided below illustrate different signaling methodsfor indicating a new PUSCH transmission timing (special subframe) in TDDUL-DL configuration #6.

TABLE 53 PUSCH transmission timing corresponding UL Index (DAI) field (2bits) to (E)PDCCH received in subframe n MSB = 1 0 (n + k) LSB = 1 1(n + 5) MSB = 1 and LSB = 1 2 (n + k and n + 5) — —

TABLE 54 PUSCH transmission timing corresponding UL Index (DAI) field (2bits) to (E)PDCCH received in subframe n 00 0 (n + k) 01 1 (n + 5) 10 2(n + k and n + 5) 11 —

In one example, a PUSCH transmission may be performed in a subframe n+k.To this end, the MSB of a UL index field which is defined by 2 bits inDCI format 0 or 4 may be set to 1, or a PHICH corresponding toI_(PHICH)=0 may be received in a subframe 1 or 6. Here, k may be definedas listed in Table 55 provided below.

TABLE 55 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 67 7 7 7 5

In another example, a PUSCH transmission may be performed in a subframen+5. To this end, the LSB of a UL index field which is defined by 2 bitsin DCI format 0 or 4 may be set to 1, or a PHICH corresponding toI_(PHICH)=1 may be received in a subframe 1 or 6.

In the above examples, I_(PHICH) may be 1 in the case of TDD UL-DLconfiguration #6 with PUSCH transmission in subframe n=1 or 6.Otherwise, I_(PHICH) may be 0.

When a UE receives an (E)PDCCH that has a 2-bit UL index field of whicha value in DCI format 0 or 4 is set to “11” in a subframe n, PUSCHtransmissions may be performed in all of the subframes n+k and n+5 ofthe above examples.

Next, a PUSCH-PHICH timing relationship will be described.

When a PUSCH is transmitted in a subframe n on a serving cell c, an eNBmay perform a PHICH transmission through a serving cell where a UL granthas been transmitted in a subframe n+k_(PHICH). This transmission mayproceed through a serving cell c in self-carrier scheduling, and throughanother serving cell in cross-carrier scheduling if Carrier Aggregation(CA) is applied. Here, k_(PHICH) may be defined as listed in Table 56provided below.

TABLE 56 TDD UL/DL subframe index n Configuration 0 1 2 3 4 5 6 7 8 9 65 4 6 6 5 4 7

Next, a PHICH-PUSCH association will be described.

A PHICH-PUSCH association is a PUSCH transmission associated withHARQ-ACK information detected through a PHICH.

In one example, a PHICH in a resource corresponding to I_(PHICH)=0(which is allocated to a UE in a subframe i for TDD UL-DL configuration#6) may be associated with a PUSCH transmission in a subframe i-k. Here,k may be defined as listed in Table 57 provided below.

TABLE 57 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 66 4 7 4 6

In another example, a PHICH in a resource corresponding to I_(PHICH)=1(which is allocated to a UE in a subframe i for TDD UL-DL configuration#6) is associated with a PUSCH transmission in a subframe i-5.

The methods for supporting a synchronous HARQ operation for a new PUSCHtransmission in a special subframe according to all of the TDD UL-DLconfigurations have been proposed. Table 58 provides the maximum numberof HARQ processes for an uplink normal HARQ operation according to eachTDD-UL-DL configuration for each UE through the above described methods.

TABLE 58 Number of HARQ processes TDD UL/DL configuration for normalHARQ operation 0 9 or 11 1 6 2 4 3 4 4 3 5 2 6 8 or 10

FIG. 11 is a diagram illustrating operations of a user equipment (UE)and an evolved nodeB (eNB) according to an embodiment of the presentdisclosure.

In operation S910, a UE receives a UL grant from an eNB. An initialtransmission of a UE's UL data or an adaptive retransmission may beindicated through a UL grant (e.g., DCI format 0 or 4 received throughan (E)PDCCH). The present disclosure assumes that an initialtransmission is indicated.

In operation S920, when the subframe for a UL data transmission (e.g., aPUSCH transmission) corresponds to a special subframe, the UE maydetermine a HARQ process corresponding to an indicated UL grant or aPHICH, based on a HARQ timing relationship according to the TDD UL-DLconfiguration in the various embodiments of the present disclosure. Forexample, according to the present disclosure, the UE (i.e., a processorof the UE) may determine HARQ timing by taking into consideration theTDD UL-DL configuration for the corresponding UE, and the set value(MSB, LSB, and MID) of an index field. Regarding the above, theprocessor may store and use the above described Tables 1 through 49, ormay calculate/derive a timing listed in the tables using a TDD UL-DLconfiguration, the set value (MSB, LSB, and MID) of a UL index field,and an I_(PHICH).

In operation S930, the UE obtains UL data to be transmitted in a specialsubframe through the determined HARQ process. In the case of a UL datainitial transmission the UE may obtain new data from another entity(e.g., multiplexing and assembly entity) in a higher layer, and in thecase of retransmission the UE may prepare data for transmission whichexists in a HARQ buffer.

In operation S940, the UE transmits the UL data in a special subframethrough a PUSCH.

In operation S950, the UE receives a UL grant or a PHICH. This may be aUL grant indicating transmission of new UL data instead of UL data thathas been transmitted in operation S940. Alternatively, this may be a ULgrant or HARQ feedback information which indicates adaptive ornonadaptive retransmission of UL data which has been transmitted inoperation S940. The present disclosure uses an example in which adaptiveretransmission of UL data is indicated. Accordingly, HARQ feedbackinformation (i.e., ACK/NACK information) with respect to the previouslytransmitted UL data may be received by the UE through the PHICH, ornonadaptive retransmission of the UL data may be indicated.

In operations S910 to S950, a subframe in which a UL grant or a PHICH isreceived is referred to as a first subframe, a subframe in which a PUSCHis transmitted is referred to as a second subframe, and a subframe inwhich HARQ feedback information (i.e., a PHICH) is received in responseto the transmitted PUSCH is referred to as a third subframe. Here, atiming relationship described according to a TDD UL-DL configuration invarious embodiments of the present disclosure may be applied to a timingrelationship among the first, second, and third subframes.

Operations S960 and S970 may determine a HARQ process and may obtain ULdata to be transmitted, similar to operations S920 and S930. Inoperation S960, when a subframe in which a UL data transmission (e.g., aPUSCH transmission) is to be performed corresponds to a specialsubframe, the UE may determine a HARQ process corresponding to anindicated UL grant or a PHICH, based on a HARQ timing relationshipaccording to the TDD UL-DL configuration in the various embodiments ofthe present disclosure. For example, the UE (i.e., a processor of theUE) according to the present disclosure may determine a HARQ timing bytaking into consideration the TDD UL-DL configuration for thecorresponding UE, the set value (MSB, LSB, and MID) of a UL index field,I_(PHICH), or the like. Regarding the above, the processor may store anduse the above described Tables 1 to 49, or may calculate/derive a timinglisted in the tables using a TDD UL-DL configuration, the set value(MSB, LSB, and MID) of a UL index field, and an I_(PHICH). In operationS970, the UE obtains UL data to be transmitted in a special subframethrough the determined HARQ process. In the case of UL dataretransmission, the UE may prepare data for transmission which exists ina HARQ buffer.

In operation S980, the UE transmits the obtained UL data to an eNBthrough a PUSCH.

In operations S950 to S980, a timing relationship described according toa TDD UL-DL configuration in various embodiments of the presentdisclosure may be applied to a timing relationship between a subframe inwhich a UL grant or a PHICH is received and a subframe in which a PUSCHis transmitted.

In the example of FIG. 11 , initial transmission of UL data may beperformed in operation S940 and retransmission of the corresponding ULdata may be performed in operation S980. However, this example may notbe limited to these operations.

FIG. 12 is a diagram illustrating the UL transmission operation of a UEaccording to the present disclosure.

In operation S1210, a UE receives a TDD UL-DL configuration from an eNB.The TDD UL-DL configuration may be received through higher layersignaling, such as SIB signaling or RRC signaling, or may besemi-statically set.

In operation S1220, the UE receives a UL grant. The UL grant may includescheduling information associated with UL data transmission.Accordingly, the UE may determine the subframe in which a UL datatransmission (e.g., a PUSCH transmission) is to be performed. The UEdetermines both a UL index field (or DAI) in DCI format 0 or 4 of the ULgrant and the LSB/MSB of the corresponding field, so as to determine thesubframe in which the transmission is performed. For example, the valueof the index field may be set to 2 bits. The UE may determine a subframethat is different based on the set bit value, that is, the PUSCHtransmission timing.

In operation S1230, the UE determines whether a subframe for a UL datatransmission is a special subframe. One or more embodiments are appliedin a configuration where the subframe in which the UL data transmissionis scheduled is a special subframe.

In operation S1240, the UE determines a HARQ timing relationship basedon a TDD UL-DL configuration, the UL index information (or a DAI insteadof a UL index) of 2 bits or 3 bits, and the like. A HARQ process may bedetermined based on the HARQ timing relationship.

In operation S1250, the UE may obtain UL data to be transmitted in aspecial subframe from either the determined HARQ process or from a HARQbuffer, and may transmit the same through a physical channel.

Although the above described illustrative methods are expressed as aseries of operations for ease of description, they do not limit theorder of operations executed, and the operations may be executed inparallel or in a different order. Also, all of the operations describedabove may not always be required to implement the method of the presentdisclosure.

The above described embodiments may include examples of various aspectsof the present disclosure. Although it is difficult to describe all thepossible combinations showing the various aspects, other combinationsare possible. Therefore, it should be understood that the presentdisclosure includes other substitutions, corrections, and modificationswithin the scope of the claims.

The scope of the present disclosure includes an apparatus that processesor implements the operations above according to various embodiments ofthe present disclosure (e.g., a wireless device and elements thereof,which will be described with reference to FIG. 13 ).

FIG. 13 is a diagram illustrating a configuration of a wireless deviceaccording to the present disclosure.

FIG. 13 illustrates a UE 100 that corresponds to an example of adownlink receiving device or an uplink transmitting device, and an eNB200 that corresponds to an example of a downlink transmitting device oran uplink receiving device.

The UE 100 may include a processor 110, an antenna unit 120, atransceiver 130, and a memory 140.

The processor 110 processes signals related to a baseband, and mayinclude a first module and a second module. The first module maycorrespond to a higher layer processing unit, and may process theoperations of a Medium Access Control (MAC) layer, a Radio ResourceControl (RRC) layer, or a higher layer. The second module may correspondto a physical layer processing unit, and may process the operations of aphysical (PHY) layer (e.g., uplink transmission signal processing ordownlink reception signal processing). However, this may not be limitedthereto. The first and the second modules may be formed as a singlemodule, or three or more modules may be separately formed. The processor110 may control the general operations of the UE 100, in addition toprocessing signals related to a baseband.

The antenna unit 120 may include one or more physical antennas, and maysupport MIMO transmission/reception when a plurality of antennas isincluded. The transceiver 130 may include a Radio Frequency (RF)transmitter and an RF receiver. The memory 140 may store informationprocessed by the processor 110, as well as software, an OS,applications, or the like associated with the operations of the UE 100,and may include elements such as a buffer or the like.

The eNB 200 may include a processor 210, an antenna unit 220, atransceiver 230, and a memory 240.

The processor 210 processes signals related to a baseband, and mayinclude a first module and a second module. The first module maycorrespond to a higher layer processing unit, and may process theoperations of a Medium Access Control (MAC) layer, a Radio ResourceControl (RRC) layer, or a higher layer. The second module may correspondto a physical layer processing unit, and may process the operations of aphysical (PHY) layer (e.g., uplink reception signal processing ordownlink transmission signal processing). However, this may not belimited thereto. The first and the second modules may be formed as asingle module, or three or more modules may be separately formed. Theprocessor 210 may control the general operations of the eNB 200, inaddition to processing signals related to a baseband.

The antenna unit 220 may include one or more physical antennas, and maysupport MIMO transmission/reception when a plurality of antennas areincluded. The transceiver 230 may include an RF transmitter and an RFreceiver. The memory 240 may store information processed by theprocessor 210, software, an operating system, applications, or the likeassociated with the operations of the eNB 200, and may include elementssuch as a buffer or the like.

The first module of the processor 110 of the UE 100 may include a HARQentity (or a HARQ operating unit) for obtaining a UL grant or HARQfeedback information received from an eNB through the second module. Thefirst module (e.g., an MAC entity) of the UE includes a single HARQentity for each serving cell. The HARQ entity may manage a plurality ofparallel HARQ processes, and may allow continuous transmission bywaiting for HARQ feedback with respect to successful or unsuccessfulreception of a previous transmission.

When a UL grant is indicated for a Transmission Time Interval (TTI) inthe corresponding TTI, the HARQ entity may determine HARQ process(es)through which a transmission is to be performed. Also, received HARQfeedback (i.e., ACK/NACK information) or the like may be transferred toHARQ process(es). Here, the HARQ entity may determine a HARQ processcorresponding to the indicated UL grant or PHICH (i.e., HARQ feedbackinformation) based on a HARQ timing relationship according to the TDDUL-DL configuration which has been described in various embodiments ofthe present disclosure. For example, the UE (i.e., a processor of theUE) according to the present disclosure may determine HARQ timing bytaking into consideration the TDD UL-DL configuration for thecorresponding UE, the set value (MSB, LSB, and MID) of a UL index field,an I_(PHICH), or the like. Regarding the above, the processor may storeand use the above described Tables 1 to 49, or may calculate/derive atiming listed in the tables using the above mentioned TDD UL-DLconfiguration, the set value (MSB, LSB, and MID) of the UL index field,and an I_(PHICH).

In the case of a new UL data transmission (or an initial transmission),when a HARQ process is determined, the HARQ entity may obtain a MACProtocol Data Unit (PDU) from a “multiplexing and assembly” entity, maytransfer the obtained MAC PDU and UL grant and HARQ information to thedetermined HARQ process, and may provide an indication to trigger a newUL transmission in the corresponding HARQ process. In the case of anadaptive retransmission, the UL grant and HARQ information aretransferred to the determined HARQ process as an indication to performan adaptive retransmission in the corresponding HARQ process. When theUL grant is not received and a HARQ buffer of the HARQ process is notempty, the HARQ entity may provide an indication to perform anonadaptive retransmission in the determined HARQ process. Accordingly,the second module of the processor 110 of the UE 100 may include a PUSCHmapping and transmitting unit that receives information required for theinitial transmission or retransmission of UL data from the HARQ entityof the first module, and then transmits the UL data to the eNB. Here,according to the present disclosure, a PUSCH may be mapped to a specialsubframe and may be transmitted to the eNB.

The first module of the processor 210 of the eNB 200 may include a ULgrant (or DCI) generating unit or a HARQ feedback information generatingunit for providing an indication that a UE will transmit UL data in aspecial subframe. The second module of the processor 210 of the eNB 200may include a DCI mapping and transmitting unit for transmitting a ULgrant transferred from the first module to the UE through a PDCCH or anEPDCCH, and may also include a HARQ feedback information mapping andtransmitting unit for transmitting HARQ feedback information transferredfrom the first module to the UE through a PHICH. Also, the second modulemay further include a UL data receiving unit for receiving a PUSCH fromthe UE, demodulating the PUSCH, and transferring the same to the firstmodule. Also, the first module may further include a HARQ entity forreceiving UL data, decoding the UL data, and generating HARQ feedbackinformation.

The above described operations of the processor 110 of the UE 100 or theprocessor 210 of the eNB 200 may be implemented by software processingor hardware processing, or may be implemented by software and hardwareprocessing.

Furthermore, the processor 110 of the UE 100 of the embodiment maycontrol to receive an Uplink (UL) grant from a base station, the ULgrant being included in a downlink time period of Time Division Duplex(TDD) cell, wherein the TDD cell having TDD UL/DL configuration 1, 2 or6; determine a resource in an Uplink Pilot Time Slot (UpPTS) of aspecial subframe of the TDD cell to transmit a PUSCH associated with thereceived UL grant, wherein the special subframe, having subframe number1 or 6, consists of a Downlink Pilot Time Slot (DwPTS), a guard period(GP), and the UpPTS; transmit, from the UE, the PUSCH mapped to theresource in the UpPTS; and receive a Physical Hybrid Automatic RepeatRequest Indicator Channel (PHICH) responsive to the PUSCH.

More, the processor 110 of the UE 100 of the embodiment may control todetermine, based on whether a PUSCH transmission occurs in a specialsubframe or an uplink subframe, a transmission time length of the PUSCHdifferently from a transmission time length of a different PUSCHtransmitted in an uplink subframe of the TDD cell. In here, theprocessor 110 of the UE 100 may control to receive a different UL grantfrom the base station; determine a different resource in an uplinksubframe of the TDD cell to transmit a different PUSCH associated withthe received different UL grant; and determine, by the UE, atransmission time length of the PUSCH to be shorter than a transmissiontime length of the different PUSCH.

Wherein the DwPTS of the special subframe corresponds to six OrthogonalFrequency Division Multiplexing (OFDM) symbols, and wherein the GP ofthe special subframe has a time period shorter than three OFDM symbols,wherein the downlink time period of the TDD cell corresponds to adownlink subframe when the TDD cell is configured to have TDD UL/DLconfiguration 1 or 6, and wherein the downlink time period of the TDDcell corresponds to a DwPTS of a different special subframe when the TDDcell is configured to have TDD UL/DL configuration 2.

When the TDD cell is configured to have TDD UL/DL configuration 6, theUE of the embodiment may process to receive a UL index field associatedwith the UL grant from the base station; and determine, based on a valueof the UL index field, a different configuration for a time intervalbetween the UL grant and the PUSCH. More, when the TDD cell isconfigured to have TDD UL/DL configuration 6, the UE may process toreceive a UL index field associated with the UL grant from the basestation; and in response to receiving the UL grant in subframe n anddetermining that least significant bit (LSB) of the UL index field is 1,determining to transmit the PUSCH in special subframe n+6, where n is 0or 5. More details, the UE of the embodiment may process and perform awhole operation of a claimed process or in each of a separated operationof the claimed process.

What is claimed is:
 1. A computer-readable medium storing instructionsthat, when executed, cause a wireless user device to: receive, during adownlink (DL) time period of time division duplex (TDD) cell, an uplink(UL) grant, wherein the TDD cell is configured with TDD UL/DLconfiguration 1, 2 or 6; transmit, based on a resource in an uplinkpilot time slot (UpPTS) of a special subframe of the TDD cell, aphysical uplink shared channel (PUSCH) signal associated with the ULgrant, wherein the special subframe, having subframe number 1 or 6,comprises a downlink pilot time slot (DwPTS), a guard period (GP), andthe UpPTS; receive a physical hybrid automatic repeat request indicatorchannel (PHICH) signal responsive to the PUSCH signal; and while the TDDcell is configured with TDD UL/DL configuration 6: receive a UL indexfield associated with the UL grant; and based on reception of the ULgrant in subframe n and a determination that least significant bit (LSB)of the UL index field is 1, determine to transmit the PUSCH signal inspecial subframe n+6, where n is 0 or 5.